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Leadtek WinFast PX6800 Ultra TDH 512MB (GeForce 6800 Ultra)
By Vincent Chang
Category : Graphics
Published by Vijay Anand on Friday, 17th June, 2005
Rating : 3.5 out of 5 stars  

The Lull Before the Launch

With both ATI and NVIDIA planning to release their next generation graphics processors soon, there has not been that much movement in the graphics card market as of late. Yes, ATI has introduced its CrossFire technology to counter NVIDIA's SLI but they are not found in retail channels yet. So what do graphics card companies do while working on the next technological breakthrough? Answer: they double the memory size of their existing products. It has happened in the past (RADEON 9800 PRO 256MB anyone?), it is happened very recently (the relatively new RADEON X800 XL 512MB) and it will likely happen again. Size does matter; with the profusion of all sorts of numbers on the packaging of a graphics card, some consumers may be confused, leading them to fall back on their own assumptions such as this:- "512MB is surely better than 256MB, right? It's twice as much and costs a bomb! Of course it MUST be better". Other more knowledgeable buyers may just desire that extra memory for the bragging rights of having the most powerful graphics card ever available (period). But how true are those assumptions?

Is more always better? Leadtek's 512MB GeForce 6800 Ultra.

There is a definite increase in performance for typical applications going from 128MB to 256MB now, given that the graphics controller is of midrange standard at least. However as we have seen in our review of the Sapphire RADEON X800 XL 512MB , the performance gains may not be as impressive as the frame buffer size seems to indicate. While the 512MB version of the ATI RADEON X800 XL managed to grab the headlines from NVIDIA for a while - which may well be the whole point of the product - there are already a few 512MB versions of NVIDIA's top range GeForce 6800 Ultra in the market for a little while now. Today, we will be looking at one such rare card, the Leadtek WinFast PX6800 Ultra TDH 512MB. Below, we list its technical specifications:

Leadtek WinFast PX6800 Ultra TDH 512MB Technical Specifications
Graphics Engine
  • NVIDIA GeForce 6800 Ultra GPU
    • Stock 2D GPU clock = 400MHz
    • Stock 3D GPU clock = 400MHz
    • 16 pixel rendering pipelines
    • 6 vertex pipelines (geometry engines)
    • 256-bit DDR3 memory controller
  • CineFX 3.0 Shading Engine
    • Vertex Shaders
      • Support for DX 9.0 Vertex Shader 3.0
      • Displacement Mapping
      • Vertex Frequency Stream Divider (Geometry Instancing)
      • Infinite length vertex programs (supported in hardware)
    • Pixel Shaders
      • Support for DX 9.0 Pixel Shader 3.0
      • Full pixel branching support
      • Multiple Render Targets (MRTs)
      • Infinite length pixel programs (supported in hardware)
    • Texturing Engine Features
      • Up to 16 textures per rendering pass
      • Support for 16-bit and 32-bit floating point formats
      • Support for sRGB texture format for gamma textures
      • DirectX and S3TC texture compression
    • Full 128-bit FP Precision Graphics Pipeline
      • Native support for 32 / 64 / 128 bits per pixel rendering modes
  • UltraShadow II Technology (accelerates shadow computations)
  • Intellisample 3.0 Technology
    • 16x Anisotropic Filtering
    • Adaptive Texture Filtering
    • Rotated Grid Antialiasing
    • Fast antialiasing and compression performance
    • Loss-less Color, Texture and Z-Data Compression algorithms (in real time)
    • Fast Z-clear
    • High-resolution Compression Technology (HCT) increases performance at high resolutions.
  • Advanced Video and Display Functionality
    • Dedicated on-chip video processor
      • MPEG video encode and decode
      • WMV9 decode acceleration
      • Advanced adaptive de-interlacing
      • High quality video scaling and filtering
    • Integrated NTSC/PAL TV encoder support resolutions up to 1024x768 with built-in Macrovision copy protection
    • DVD and HDTV-ready MPEG-2 decoding up to 1920x1080i resolutions
    • Dual 400MHz RAMDACs that support resolutions of 2048x1536@85Hz
    • Dual DVO ports for interfacing external TMDS transmitters and external TV/HDTV encoder
    • Microsoft Video Mixing Renderer (VMR)
    • nView Multi-display Technology
  • Digital Vibrance Control (DVC) 3.0
  • NVIDIA High-Precision Dynamic-Range (HPDR) Technology
  • Advanced thermal monitoring and thermal management
Graphics Memory
  • 512MB Graphic DDR3 SDRAM
  • Default memory clock = 1050MHz DDR
  • 256-bit memory interface
  • Dual integrated 10-bit per channel 400 MHz DACs that support resolutions of 2048x1536@85Hz
  • Integrated 165 MHz TMDS transmitter (DVI 1.0 compliant and HDCP ready)
  • 1 x S-Video output
  • 2 x DVI-I connectors
Drivers & Software
  • Driver support for Windows 98 / Me / 2000 / XP
  • Splinter Cell: Pandora Tomorrow
  • Prince of Persia: Warrior Within
  • WinFast DVD
Other Information
  • 2 free PCI Express slots required
  • Minimum 350W PSU required

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